package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONUtil;
import com.hmdp.dto.Result;
import com.hmdp.entity.ShopType;
import com.hmdp.mapper.ShopTypeMapper;
import com.hmdp.service.IShopTypeService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.utils.RedisConstants;
import org.springframework.beans.BeanUtils;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;


import javax.annotation.Resource;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.TimeUnit;
import java.util.stream.Collectors;

/**
 * <p>
 *  服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
public class ShopTypeServiceImpl extends ServiceImpl<ShopTypeMapper, ShopType> implements IShopTypeService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result queryTypeList() {
        // 1. 从redis中查询列表
        String key = RedisConstants.CACHE_SHOP_TYPE_KEY;
        String shopType=stringRedisTemplate.opsForValue().get("shopType");
        // 2. 判断是否存在
        if (StrUtil.isNotBlank(shopType)) {
            //存在，直接返回
            List<ShopType> shopTypes = JSONUtil.toList(shopType, ShopType.class);
            return Result.ok(shopTypes);
        }

        // 3. 不存在，查询数据库
        List<ShopType> typeList = query().orderByAsc("sort").list();
        if (typeList == null){
            // 4.1 数据库不存在，返回错误
            return Result.fail("店铺列表不存在");
        }
        // 4. 存在，写入redis
        stringRedisTemplate.opsForValue().set(key, JSONUtil.toJsonStr(typeList), RedisConstants.CACHE_SHOP_TYPE_TTL, TimeUnit.MINUTES);
        // 5. 返回
        return Result.ok(typeList);
    }
}
